12-21-2006
Explanation
I think i can explain this,
If u take the third line values 1 2 are in the 6th and 7th column position.But the awk assumes that there are only two fields in it and as it didnt has 7th column it prints the previous value 'S'.The same case for 30 also,If u take the last line there are only 1 field(31),again prints the previous value 30
And thats the reason it prints in this format.
Regards,
cskumar.
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PR(1) General Commands Manual PR(1)
NAME
pr - print file
SYNOPSIS
pr [ option ] ... [ file ] ...
DESCRIPTION
Pr produces a printed listing of one or more files. The output is separated into pages headed by a date, the name of the file or a speci-
fied header, and the page number. If there are no file arguments, pr prints its standard input.
Options apply to all following files but may be reset between files:
-n Produce n-column output.
+n Begin printing with page n.
-h Take the next argument as a page header.
-wn For purposes of multi-column output, take the width of the page to be n characters instead of the default 72.
-ln Take the length of the page to be n lines instead of the default 66.
-t Do not print the 5-line header or the 5-line trailer normally supplied for each page.
-sc Separate columns by the single character c instead of by the appropriate amount of white space. A missing c is taken to be a tab.
-m Print all files simultaneously, each in one column,
Inter-terminal messages via write(1) are forbidden during a pr.
FILES
/dev/tty? to suspend messages.
SEE ALSO
cat(1)
DIAGNOSTICS
There are no diagnostics when pr is printing on a terminal.
PR(1)